Jan 22, 2018 - 8:43 PM
in reply to R2go
On Sunday's shops are closed anyway. Museums could be closed on Whit Sunday but should be open again on Whit Monday. Restaurants will be open.
It's not a major holiday, but for sure it will be more crowded at some places when the weather is nice and people go out. But I don't know what you would consider as being crowded. I've been living in Switzerland for almost 10 years now and I've never been to a place which was too crowded.
Trains, buses and cable cars will operate (perhaps less frequently), so any outdoor highlight can be visited. Please refer to the Swiss timetable.
Pentecost or not mid May is quiet in the higher mountain resorts such as Zermatt anyway, because the ski season has ended but the summer season has not started. Quite a few hotels and restaurants will be closed.
I would look at how the Glacier Express fits in with your overall visit to Switzerland. Regardless of Pentecost.
, book the Glacier Express the way it fits best in your overall visit.